Febrile is an adjective that means having or showing a great deal of nervous excitement or energy. 

Our word of the day comes from the Latin word febris (FAY brees) means ‘fever.’ Our word of the day has been around since the mid 17th century and may be used as a literal reference to a fever or may be used figuratively to mean ‘showing great excitement.’ Example:

Tommy’s Febrile demeanor tends to make some people uneasy. But others find themselves falling into a sense of excitement themselves.